ACL CAT Lists the ACL categories, or the commands inside a category.
ACL DELUSER Deletes ACL users, and terminates their connections.
ACL DRYRUN Simulates the execution of a command by a user, without executing the command.
ACL GENPASS Generates a pseudorandom, secure password that can be used to identify ACL users.
ACL GETUSER Lists the ACL rules of a user.
ACL HELP Returns helpful text about the different subcommands.
ACL LIST Dumps the effective rules in ACL file format.
ACL LOAD Reloads the rules from the configured ACL file.
ACL LOG Lists recent security events generated due to ACL rules.
ACL SAVE Saves the effective ACL rules in the configured ACL file.
ACL SETUSER Creates and modifies an ACL user and its rules.
ACL USERS Lists all ACL users.
ACL WHOAMI Returns the authenticated username of the current connection.
ACL A container for Access List Control commands.
APPEND Appends a string to the value of a key. Creates the key if it doesn't exist.
ASKING Signals that a cluster client is following an -ASK redirect.
AUTH Authenticates the connection.
BGREWRITEAOF Asynchronously rewrites the append-only file to disk.
BGSAVE Asynchronously saves the database(s) to disk.
BITCOUNT Counts the number of set bits (population counting) in a string.
BITFIELD Performs arbitrary bitfield integer operations on strings.
BITFIELD_RO Performs arbitrary read-only bitfield integer operations on strings.
BITOP Performs bitwise operations on multiple strings, and stores the result.
BITPOS Finds the first set (1) or clear (0) bit in a string.
BLMOVE Pops an element from a list, pushes it to another list and returns it. Blocks until an element is available otherwise. Deletes the list if the last element was moved.
BLMPOP Pops the first element from one of multiple lists. Blocks until an element is available otherwise. Deletes the list if the last element was popped.
BLPOP Removes and returns the first element in a list. Blocks until an element is available otherwise. Deletes the list if the last element was popped.
BRPOP Removes and returns the last element in a list. Blocks until an element is available otherwise. Deletes the list if the last element was popped.
BRPOPLPUSH Pops an element from a list, pushes it to another list and returns it. Block until an element is available otherwise. Deletes the list if the last element was popped.
BZMPOP Removes and returns a member by score from one or more sorted sets. Blocks until a member is available otherwise. Deletes the sorted set if the last element was popped.
BZPOPMAX Removes and returns the member with the highest score from one or more sorted sets. Blocks until a member available otherwise. Deletes the sorted set if the last element was popped.
BZPOPMIN Removes and returns the member with the lowest score from one or more sorted sets. Blocks until a member is available otherwise. Deletes the sorted set if the last element was popped.
CLIENT CACHING Instructs the server whether to track the keys in the next request.
CLIENT GETNAME Returns the name of the connection.
CLIENT GETREDIR Returns the client ID to which the connection's tracking notifications are redirected.
CLIENT HELP Returns helpful text about the different subcommands.
CLIENT ID Returns the unique client ID of the connection.
CLIENT INFO Returns information about the connection.
CLIENT KILL Terminates open connections.
CLIENT LIST Lists open connections.
CLIENT NO-EVICT Sets the client eviction mode of the connection.
CLIENT NO-TOUCH Controls whether commands sent by the client affect the LRU/LFU of accessed keys.
CLIENT PAUSE Suspends commands processing.
CLIENT REPLY Instructs the server whether to reply to commands.
CLIENT SETINFO Sets information specific to the client or connection.
CLIENT SETNAME Sets the connection name.
CLIENT TRACKING Controls server-assisted client-side caching for the connection.
CLIENT TRACKINGINFO Returns information about server-assisted client-side caching for the connection.
CLIENT UNBLOCK Unblocks a client blocked by a blocking command from a different connection.
CLIENT UNPAUSE Resumes processing commands from paused clients.
CLIENT A container for client connection commands.
CLUSTER ADDSLOTS Assigns new hash slots to a node.
CLUSTER ADDSLOTSRANGE Assigns new hash slot ranges to a node.
CLUSTER BUMPEPOCH Advances the cluster config epoch.
CLUSTER COUNT-FAILURE-REPORTS Returns the number of active failure reports active for a node.
CLUSTER COUNTKEYSINSLOT Returns the number of keys in a hash slot.
CLUSTER DELSLOTS Sets hash slots as unbound for a node.
CLUSTER DELSLOTSRANGE Sets hash slot ranges as unbound for a node.
CLUSTER FAILOVER Forces a replica to perform a manual failover of its master.
CLUSTER FLUSHSLOTS Deletes all slots information from a node.
CLUSTER FORGET Removes a node from the nodes table.
CLUSTER GETKEYSINSLOT Returns the key names in a hash slot.
CLUSTER HELP Returns helpful text about the different subcommands.
CLUSTER INFO Returns information about the state of a node.
CLUSTER KEYSLOT Returns the hash slot for a key.
CLUSTER LINKS Returns a list of all TCP links to and from peer nodes.
CLUSTER MEET Forces a node to handshake with another node.
CLUSTER MYID Returns the ID of a node.
CLUSTER MYSHARDID Returns the shard ID of a node.
CLUSTER NODES Returns the cluster configuration for a node.
CLUSTER REPLICAS Lists the replica nodes of a master node.
CLUSTER REPLICATE Configure a node as replica of a master node.
CLUSTER RESET Resets a node.
CLUSTER SAVECONFIG Forces a node to save the cluster configuration to disk.
CLUSTER SET-CONFIG-EPOCH Sets the configuration epoch for a new node.
CLUSTER SETSLOT Binds a hash slot to a node.
CLUSTER SHARDS Returns the mapping of cluster slots to shards.
CLUSTER SLAVES Lists the replica nodes of a master node.
CLUSTER SLOTS Returns the mapping of cluster slots to nodes.
CLUSTER A container for Cluster commands.
COMMAND COUNT Returns a count of commands.
COMMAND DOCS Returns documentary information about one, multiple or all commands.
COMMAND GETKEYS Extracts the key names from an arbitrary command.
COMMAND GETKEYSANDFLAGS Extracts the key names and access flags for an arbitrary command.
COMMAND HELP Returns helpful text about the different subcommands.
COMMAND INFO Returns information about one, multiple or all commands.
COMMAND LIST Returns a list of command names.
COMMAND Returns detailed information about all commands.
CONFIG GET Returns the effective values of configuration parameters.
CONFIG HELP Returns helpful text about the different subcommands.
CONFIG RESETSTAT Resets the server's statistics.
CONFIG REWRITE Persists the effective configuration to file.
CONFIG SET Sets configuration parameters in-flight.
CONFIG A container for server configuration commands.
COPY Copies the value of a key to a new key.
DBSIZE Returns the number of keys in the database.
DEBUG A container for debugging commands.
DECR Decrements the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.
DECRBY Decrements a number from the integer value of a key. Uses 0 as initial value if the key doesn't exist.
DEL Deletes one or more keys.
DISCARD Discards a transaction.
DUMP Returns a serialized representation of the value stored at a key.
ECHO Returns the given string.
EVAL Executes a server-side Lua script.
EVAL_RO Executes a read-only server-side Lua script.
EVALSHA Executes a server-side Lua script by SHA1 digest.
EVALSHA_RO Executes a read-only server-side Lua script by SHA1 digest.
EXEC Executes all commands in a transaction.
EXISTS Determines whether one or more keys exist.
EXPIRE Sets the expiration time of a key in seconds.
EXPIREAT Sets the expiration time of a key to a Unix timestamp.
EXPIRETIME Returns the expiration time of a key as a Unix timestamp.
FAILOVER Starts a coordinated failover from a server to one of its replicas.
FCALL Invokes a function.
FCALL_RO Invokes a read-only function.
FLUSHALL Removes all keys from all databases.
FLUSHDB Remove all keys from the current database.
FUNCTION DELETE Deletes a library and its functions.
FUNCTION DUMP Dumps all libraries into a serialized binary payload.
FUNCTION FLUSH Deletes all libraries and functions.
FUNCTION HELP Returns helpful text about the different subcommands.
FUNCTION KILL Terminates a function during execution.
FUNCTION LIST Returns information about all libraries.
FUNCTION LOAD Creates a library.
FUNCTION RESTORE Restores all libraries from a payload.
FUNCTION STATS Returns information about a function during execution.
FUNCTION A container for function commands.
GEOADD Adds one or more members to a geospatial index. The key is created if it doesn't exist.
GEODIST Returns the distance between two members of a geospatial index.
GEOHASH Returns members from a geospatial index as geohash strings.
GEOPOS Returns the longitude and latitude of members from a geospatial index.
GEORADIUS Queries a geospatial index for members within a distance from a coordinate, optionally stores the result.
GEORADIUS_RO Returns members from a geospatial index that are within a distance from a coordinate.
GEORADIUSBYMEMBER Queries a geospatial index for members within a distance from a member, optionally stores the result.
GEORADIUSBYMEMBER_RO Returns members from a geospatial index that are within a distance from a member.
GEOSEARCH Queries a geospatial index for members inside an area of a box or a circle.
GEOSEARCHSTORE Queries a geospatial index for members inside an area of a box or a circle, optionally stores the result.
GET Returns the string value of a key.
GETBIT Returns a bit value by offset.
GETDEL Returns the string value of a key after deleting the key.
GETEX Returns the string value of a key after setting its expiration time.
GETRANGE Returns a substring of the string stored at a key.
GETSET Returns the previous string value of a key after setting it to a new value.
HDEL Deletes one or more fields and their values from a hash. Deletes the hash if no fields remain.
HELLO Handshakes with the server.
HEXISTS Determines whether a field exists in a hash.
HGET Returns the value of a field in a hash.
HGETALL Returns all fields and values in a hash.
HINCRBY Increments the integer value of a field in a hash by a number. Uses 0 as initial value if the field doesn't exist.
HINCRBYFLOAT Increments the floating point value of a field by a number. Uses 0 as initial value if the field doesn't exist.
HKEYS Returns all fields in a hash.
HLEN Returns the number of fields in a hash.
HMGET Returns the values of all fields in a hash.
HMSET Sets the values of multiple fields.
HRANDFIELD Returns one or more random fields from a hash.
HSCAN Iterates over fields and values of a hash.
HSET Creates or modifies the value of a field in a hash.
HSETNX Sets the value of a field in a hash only when the field doesn't exist.
HSTRLEN Returns the length of the value of a field.
HVALS Returns all values in a hash.
INCR Increments the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.
INCRBY Increments the integer value of a key by a number. Uses 0 as initial value if the key doesn't exist.
INCRBYFLOAT Increment the floating point value of a key by a number. Uses 0 as initial value if the key doesn't exist.
INFO Returns information and statistics about the server.
KEYS Returns all key names that match a pattern.
LASTSAVE Returns the Unix timestamp of the last successful save to disk.
LATENCY DOCTOR Returns a human-readable latency analysis report.
LATENCY GRAPH Returns a latency graph for an event.
LATENCY HELP Returns helpful text about the different subcommands.
LATENCY HISTOGRAM Returns the cumulative distribution of latencies of a subset or all commands.
LATENCY HISTORY Returns timestamp-latency samples for an event.
LATENCY LATEST Returns the latest latency samples for all events.
LATENCY RESET Resets the latency data for one or more events.
LATENCY A container for latency diagnostics commands.
LCS Finds the longest common substring.
LINDEX Returns an element from a list by its index.
LINSERT Inserts an element before or after another element in a list.
LLEN Returns the length of a list.
LMOVE Returns an element after popping it from one list and pushing it to another. Deletes the list if the last element was moved.
LMPOP Returns multiple elements from a list after removing them. Deletes the list if the last element was popped.
LOLWUT Displays computer art and the server version
LPOP Returns the first elements in a list after removing it. Deletes the list if the last element was popped.
LPOS Returns the index of matching elements in a list.
LPUSH Prepends one or more elements to a list. Creates the key if it doesn't exist.
LPUSHX Prepends one or more elements to a list only when the list exists.
LRANGE Returns a range of elements from a list.
LREM Removes elements from a list. Deletes the list if the last element was removed.
LSET Sets the value of an element in a list by its index.
LTRIM Removes elements from both ends a list. Deletes the list if all elements were trimmed.
MEMORY DOCTOR Outputs a memory problems report.
MEMORY HELP Returns helpful text about the different subcommands.
MEMORY MALLOC-STATS Returns the allocator statistics.
MEMORY PURGE Asks the allocator to release memory.
MEMORY STATS Returns details about memory usage.
MEMORY USAGE Estimates the memory usage of a key.
MEMORY A container for memory diagnostics commands.
MGET Atomically returns the string values of one or more keys.
MIGRATE Atomically transfers a key from one instance to another.
MODULE HELP Returns helpful text about the different subcommands.
MODULE LIST Returns all loaded modules.
MODULE LOAD Loads a module.
MODULE LOADEX Loads a module using extended parameters.
MODULE UNLOAD Unloads a module.
MODULE A container for module commands.
MONITOR Listens for all requests received by the server in real-time.
MOVE Moves a key to another database.
MSET Atomically creates or modifies the string values of one or more keys.
MSETNX Atomically modifies the string values of one or more keys only when all keys don't exist.
MULTI Starts a transaction.
OBJECT ENCODING Returns the internal encoding of an object.
OBJECT FREQ Returns the logarithmic access frequency counter of an object.
OBJECT HELP Returns helpful text about the different subcommands.
OBJECT IDLETIME Returns the time since the last access to an object.
OBJECT REFCOUNT Returns the reference count of a value of a key.
OBJECT A container for object introspection commands.
PERSIST Removes the expiration time of a key.
PEXPIRE Sets the expiration time of a key in milliseconds.
PEXPIREAT Sets the expiration time of a key to a Unix milliseconds timestamp.
PEXPIRETIME Returns the expiration time of a key as a Unix milliseconds timestamp.
PFADD Adds elements to a HyperLogLog key. Creates the key if it doesn't exist.
PFCOUNT Returns the approximated cardinality of the set(s) observed by the HyperLogLog key(s).
PFDEBUG Internal commands for debugging HyperLogLog values.
PFMERGE Merges one or more HyperLogLog values into a single key.
PFSELFTEST An internal command for testing HyperLogLog values.
PING Returns the server's liveliness response.
PSETEX Sets both string value and expiration time in milliseconds of a key. The key is created if it doesn't exist.
PSUBSCRIBE Listens for messages published to channels that match one or more patterns.
PSYNC An internal command used in replication.
PTTL Returns the expiration time in milliseconds of a key.
PUBLISH Posts a message to a channel.
PUBSUB CHANNELS Returns the active channels.
PUBSUB HELP Returns helpful text about the different subcommands.
PUBSUB NUMPAT Returns a count of unique pattern subscriptions.
PUBSUB NUMSUB Returns a count of subscribers to channels.
PUBSUB SHARDCHANNELS Returns the active shard channels.
PUBSUB SHARDNUMSUB Returns the count of subscribers of shard channels.
PUBSUB A container for Pub/Sub commands.
PUNSUBSCRIBE Stops listening to messages published to channels that match one or more patterns.
QUIT Closes the connection.
RANDOMKEY Returns a random key name from the database.
READONLY Enables read-only queries for a connection to a Cluster replica node.
READWRITE Enables read-write queries for a connection to a Reids Cluster replica node.
RENAME Renames a key and overwrites the destination.
RENAMENX Renames a key only when the target key name doesn't exist.
REPLCONF An internal command for configuring the replication stream.
REPLICAOF Configures a server as replica of another, or promotes it to a master.
RESET Resets the connection.
RESTORE-ASKING An internal command for migrating keys in a cluster.
RESTORE Creates a key from the serialized representation of a value.
ROLE Returns the replication role.
RPOP Returns and removes the last elements of a list. Deletes the list if the last element was popped.
RPOPLPUSH Returns the last element of a list after removing and pushing it to another list. Deletes the list if the last element was popped.
RPUSH Appends one or more elements to a list. Creates the key if it doesn't exist.
RPUSHX Appends an element to a list only when the list exists.
SADD Adds one or more members to a set. Creates the key if it doesn't exist.
SAVE Synchronously saves the database(s) to disk.
SCAN Iterates over the key names in the database.
SCARD Returns the number of members in a set.
SCRIPT DEBUG Sets the debug mode of server-side Lua scripts.
SCRIPT EXISTS Determines whether server-side Lua scripts exist in the script cache.
SCRIPT FLUSH Removes all server-side Lua scripts from the script cache.
SCRIPT HELP Returns helpful text about the different subcommands.
SCRIPT KILL Terminates a server-side Lua script during execution.
SCRIPT LOAD Loads a server-side Lua script to the script cache.
SCRIPT A container for Lua scripts management commands.
SDIFF Returns the difference of multiple sets.
SDIFFSTORE Stores the difference of multiple sets in a key.
SELECT Changes the selected database.
SENTINEL CKQUORUM Checks for a Sentinel quorum.
SENTINEL CONFIG Configures Sentinel.
SENTINEL DEBUG Lists or updates the current configurable parameters of Sentinel.
SENTINEL FAILOVER Forces a Sentinel failover.
SENTINEL FLUSHCONFIG Rewrites the Sentinel configuration file.
SENTINEL GET-MASTER-ADDR-BY-NAME Returns the port and address of a master instance.
SENTINEL HELP Returns helpful text about the different subcommands.
SENTINEL INFO-CACHE Returns the cached `INFO` replies from the deployment's instances.
SENTINEL IS-MASTER-DOWN-BY-ADDR Determines whether a master instance is down.
SENTINEL MASTER Returns the state of a master instance.
SENTINEL MASTERS Returns a list of monitored masters.
SENTINEL MONITOR Starts monitoring.
SENTINEL MYID Returns the Sentinel instance ID.
SENTINEL PENDING-SCRIPTS Returns information about pending scripts for Sentinel.
SENTINEL REMOVE Stops monitoring.
SENTINEL REPLICAS Returns a list of the monitored replicas.
SENTINEL RESET Resets masters by name matching a pattern.
SENTINEL SENTINELS Returns a list of Sentinel instances.
SENTINEL SET Changes the configuration of a monitored master.
SENTINEL SIMULATE-FAILURE Simulates failover scenarios.
SENTINEL SLAVES Returns a list of the monitored replicas.
SENTINEL A container for Sentinel commands.
SET Sets the string value of a key, ignoring its type. The key is created if it doesn't exist.
SETBIT Sets or clears the bit at offset of the string value. Creates the key if it doesn't exist.
SETEX Sets the string value and expiration time of a key. Creates the key if it doesn't exist.
SETNX Set the string value of a key only when the key doesn't exist.
SETRANGE Overwrites a part of a string value with another by an offset. Creates the key if it doesn't exist.
SHUTDOWN Synchronously saves the database(s) to disk and shuts down the server.
SINTER Returns the intersect of multiple sets.
SINTERCARD Returns the number of members of the intersect of multiple sets.
SINTERSTORE Stores the intersect of multiple sets in a key.
SISMEMBER Determines whether a member belongs to a set.
SLAVEOF Sets a server as a replica of another, or promotes it to being a master.
SLOWLOG GET Returns the slow log's entries.
SLOWLOG HELP Show helpful text about the different subcommands
SLOWLOG LEN Returns the number of entries in the slow log.
SLOWLOG RESET Clears all entries from the slow log.
SLOWLOG A container for slow log commands.
SMEMBERS Returns all members of a set.
SMISMEMBER Determines whether multiple members belong to a set.
SMOVE Moves a member from one set to another.
SORT Sorts the elements in a list, a set, or a sorted set, optionally storing the result.
SORT_RO Returns the sorted elements of a list, a set, or a sorted set.
SPOP Returns one or more random members from a set after removing them. Deletes the set if the last member was popped.
SPUBLISH Post a message to a shard channel
SRANDMEMBER Get one or multiple random members from a set
SREM Removes one or more members from a set. Deletes the set if the last member was removed.
SSCAN Iterates over members of a set.
SSUBSCRIBE Listens for messages published to shard channels.
STRLEN Returns the length of a string value.
SUBSCRIBE Listens for messages published to channels.
SUBSTR Returns a substring from a string value.
SUNION Returns the union of multiple sets.
SUNIONSTORE Stores the union of multiple sets in a key.
SUNSUBSCRIBE Stops listening to messages posted to shard channels.
SWAPDB Swaps two databases.
SYNC An internal command used in replication.
TIME Returns the server time.
TOUCH Returns the number of existing keys out of those specified after updating the time they were last accessed.
TTL Returns the expiration time in seconds of a key.
TYPE Determines the type of value stored at a key.
UNLINK Asynchronously deletes one or more keys.
UNSUBSCRIBE Stops listening to messages posted to channels.
UNWATCH Forgets about watched keys of a transaction.
WAIT Blocks until the asynchronous replication of all preceding write commands sent by the connection is completed.
WAITAOF Blocks until all of the preceding write commands sent by the connection are written to the append-only file of the master and/or replicas.
WATCH Monitors changes to keys to determine the execution of a transaction.
XACK Returns the number of messages that were successfully acknowledged by the consumer group member of a stream.
XADD Appends a new message to a stream. Creates the key if it doesn't exist.
XAUTOCLAIM Changes, or acquires, ownership of messages in a consumer group, as if the messages were delivered to as consumer group member.
XCLAIM Changes, or acquires, ownership of a message in a consumer group, as if the message was delivered a consumer group member.
XDEL Returns the number of messages after removing them from a stream.
XGROUP CREATE Creates a consumer group.
XGROUP CREATECONSUMER Creates a consumer in a consumer group.
XGROUP DELCONSUMER Deletes a consumer from a consumer group.
XGROUP DESTROY Destroys a consumer group.
XGROUP HELP Returns helpful text about the different subcommands.
XGROUP SETID Sets the last-delivered ID of a consumer group.
XGROUP A container for consumer groups commands.
XINFO CONSUMERS Returns a list of the consumers in a consumer group.
XINFO GROUPS Returns a list of the consumer groups of a stream.
XINFO HELP Returns helpful text about the different subcommands.
XINFO STREAM Returns information about a stream.
XINFO A container for stream introspection commands.
XLEN Return the number of messages in a stream.
XPENDING Returns the information and entries from a stream consumer group's pending entries list.
XRANGE Returns the messages from a stream within a range of IDs.
XREAD Returns messages from multiple streams with IDs greater than the ones requested. Blocks until a message is available otherwise.
XREADGROUP Returns new or historical messages from a stream for a consumer in a group. Blocks until a message is available otherwise.
XREVRANGE Returns the messages from a stream within a range of IDs in reverse order.
XSETID An internal command for replicating stream values.
XTRIM Deletes messages from the beginning of a stream.
ZADD Adds one or more members to a sorted set, or updates their scores. Creates the key if it doesn't exist.
ZCARD Returns the number of members in a sorted set.
ZCOUNT Returns the count of members in a sorted set that have scores within a range.
ZDIFF Returns the difference between multiple sorted sets.
ZDIFFSTORE Stores the difference of multiple sorted sets in a key.
ZINCRBY Increments the score of a member in a sorted set.
ZINTER Returns the intersect of multiple sorted sets.
ZINTERCARD Returns the number of members of the intersect of multiple sorted sets.
ZINTERSTORE Stores the intersect of multiple sorted sets in a key.
ZLEXCOUNT Returns the number of members in a sorted set within a lexicographical range.
ZMPOP Returns the highest- or lowest-scoring members from one or more sorted sets after removing them. Deletes the sorted set if the last member was popped.
ZMSCORE Returns the score of one or more members in a sorted set.
ZPOPMAX Returns the highest-scoring members from a sorted set after removing them. Deletes the sorted set if the last member was popped.
ZPOPMIN Returns the lowest-scoring members from a sorted set after removing them. Deletes the sorted set if the last member was popped.
ZRANDMEMBER Returns one or more random members from a sorted set.
ZRANGE Returns members in a sorted set within a range of indexes.
ZRANGEBYLEX Returns members in a sorted set within a lexicographical range.
ZRANGEBYSCORE Returns members in a sorted set within a range of scores.
ZRANGESTORE Stores a range of members from sorted set in a key.
ZRANK Returns the index of a member in a sorted set ordered by ascending scores.
ZREM Removes one or more members from a sorted set. Deletes the sorted set if all members were removed.
ZREMRANGEBYLEX Removes members in a sorted set within a lexicographical range. Deletes the sorted set if all members were removed.
ZREMRANGEBYRANK Removes members in a sorted set within a range of indexes. Deletes the sorted set if all members were removed.
ZREMRANGEBYSCORE Removes members in a sorted set within a range of scores. Deletes the sorted set if all members were removed.
ZREVRANGE Returns members in a sorted set within a range of indexes in reverse order.
ZREVRANGEBYLEX Returns members in a sorted set within a lexicographical range in reverse order.
ZREVRANGEBYSCORE Returns members in a sorted set within a range of scores in reverse order.
ZREVRANK Returns the index of a member in a sorted set ordered by descending scores.
ZSCAN Iterates over members and scores of a sorted set.
ZSCORE Returns the score of a member in a sorted set.
ZUNION Returns the union of multiple sorted sets.
ZUNIONSTORE Stores the union of multiple sorted sets in a key.
